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This ½ oz bottle of OTO (Orthotolidine) checks your pool water's chlorine level. OTO is a reliable test solution that accurately measures the free chlorine present in your pool. With just a few drops, the solution will change color, indicating whether your chlorine levels are too high, too low, or within the optimal range.
For use with the Chlorine, Bromine & pH 3-Way Test Kit.
Note: Read back panel carefully, be sure to keep OTO solution away from skin and eyes. Keep this tester out of reach of children.
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| Brand | Aqua Select® |
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